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authorDavid S. Miller <davem@davemloft.net>2013-01-21 14:13:04 -0800
committerDavid S. Miller <davem@davemloft.net>2013-01-21 14:15:30 -0800
commit7c1e01aabcec96173b6e276e67322125ec90dff7 (patch)
treeea47e29091c290fe359baad475699b33ddb86418 /sysdeps/sparc
parentab087e0aa4bd9f12a73ca0b248f02d8a22d49e46 (diff)
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Use libgcc unwinder for sparc backtraces, if available.
* sysdeps/sparc/backtrace.c: New file. * sysdeps/sparc/sparc32/backtrace.h: New file. * sysdeps/sparc/sparc32/sparcv9/backtrace.h: New file. * sysdeps/sparc/sparc64/backtrace.h: New file. * sysdeps/sparc/sparc64/backtrace.c: Delete. * sysdeps/sparc/Makefile (CFLAGS-backtrace.c): Add -funwind-tables.
Diffstat (limited to 'sysdeps/sparc')
-rw-r--r--sysdeps/sparc/Makefile4
-rw-r--r--sysdeps/sparc/backtrace.c163
-rw-r--r--sysdeps/sparc/sparc32/backtrace.h7
-rw-r--r--sysdeps/sparc/sparc32/sparcv9/backtrace.h7
-rw-r--r--sysdeps/sparc/sparc64/backtrace.c57
-rw-r--r--sysdeps/sparc/sparc64/backtrace.h7
6 files changed, 188 insertions, 57 deletions
diff --git a/sysdeps/sparc/Makefile b/sysdeps/sparc/Makefile
index 3f0c096400..31aaeaed8f 100644
--- a/sysdeps/sparc/Makefile
+++ b/sysdeps/sparc/Makefile
@@ -3,6 +3,10 @@ long-double-fcts = yes
pie-ccflag = -fPIE
+ifeq ($(subdir),debug)
+CFLAGS-backtrace.c += -funwind-tables
+endif
+
ifeq ($(subdir),gmon)
sysdep_routines += sparc-mcount
endif
diff --git a/sysdeps/sparc/backtrace.c b/sysdeps/sparc/backtrace.c
new file mode 100644
index 0000000000..89f976b06c
--- /dev/null
+++ b/sysdeps/sparc/backtrace.c
@@ -0,0 +1,163 @@
+/* Return backtrace of current program state.
+ Copyright (C) 2013 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by David S. Miller <davem@davemloft.net>
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#include <execinfo.h>
+#include <stddef.h>
+#include <bp-checks.h>
+#include <sysdep.h>
+#include <sys/trap.h>
+#include <dlfcn.h>
+#include <unwind.h>
+#include <backtrace.h>
+
+struct layout
+{
+ unsigned long locals[8];
+ unsigned long ins[6];
+ unsigned long next;
+ void *__unbounded return_address;
+};
+
+struct trace_arg
+{
+ void **array;
+ _Unwind_Word cfa;
+ int cnt;
+ int size;
+};
+
+#ifdef SHARED
+static _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *);
+static _Unwind_Ptr (*unwind_getip) (struct _Unwind_Context *);
+static _Unwind_Word (*unwind_getcfa) (struct _Unwind_Context *);
+static void *libgcc_handle;
+
+/* Dummy version in case libgcc_s does not contain the real code. */
+static _Unwind_Word
+dummy_getcfa (struct _Unwind_Context *ctx __attribute__ ((unused)))
+{
+ return 0;
+}
+
+static void
+init (void)
+{
+ libgcc_handle = __libc_dlopen ("libgcc_s.so.1");
+
+ if (libgcc_handle == NULL)
+ return;
+
+ unwind_backtrace = __libc_dlsym (libgcc_handle, "_Unwind_Backtrace");
+ unwind_getip = __libc_dlsym (libgcc_handle, "_Unwind_GetIP");
+ if (unwind_getip == NULL)
+ unwind_backtrace = NULL;
+ unwind_getcfa = (__libc_dlsym (libgcc_handle, "_Unwind_GetCFA")
+ ?: dummy_getcfa);
+}
+#else
+# define unwind_backtrace _Unwind_Backtrace
+# define unwind_getip _Unwind_GetIP
+# define unwind_getcfa _Unwind_GetCFA
+#endif
+
+static _Unwind_Reason_Code
+backtrace_helper (struct _Unwind_Context *ctx, void *a)
+{
+ struct trace_arg *arg = a;
+ _Unwind_Ptr ip;
+
+ /* We are first called with address in the __backtrace function.
+ Skip it. */
+ if (arg->cnt != -1)
+ {
+ ip = unwind_getip (ctx);
+ arg->array[arg->cnt] = (void *) ip;
+
+ /* Check whether we make any progress. */
+ _Unwind_Word cfa = unwind_getcfa (ctx);
+
+ if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt]
+ && cfa == arg->cfa)
+ return _URC_END_OF_STACK;
+ arg->cfa = cfa;
+ }
+ if (++arg->cnt == arg->size)
+ return _URC_END_OF_STACK;
+ return _URC_NO_REASON;
+}
+
+int
+__backtrace (void **array, int size)
+{
+ struct trace_arg arg = { .array = array, .cfa = 0, .size = size, .cnt = -1 };
+ bool use_unwinder;
+ int count;
+
+ if (!size)
+ return 0;
+
+ use_unwinder = true;
+#ifdef SHARED
+ __libc_once_define (static, once);
+
+ __libc_once (once, init);
+ if (unwind_backtrace == NULL)
+ use_unwinder = false;
+#endif
+
+ if (use_unwinder == false)
+ {
+ struct layout *current;
+ unsigned long fp, i7;
+
+ asm volatile ("mov %%fp, %0" : "=r"(fp));
+ asm volatile ("mov %%i7, %0" : "=r"(i7));
+ current = (struct layout *__unbounded) (fp + BACKTRACE_STACK_BIAS);
+ current = BOUNDED_1 (current);
+
+ array[0] = (void *__unbounded) i7;
+
+ if (size == 1)
+ return 1;
+
+ backtrace_flush_register_windows();
+ for (count = 1; count < size; count++)
+ {
+ array[count] = current->return_address;
+ if (!current->next)
+ break;
+ current = (struct layout *__unbounded) (current->next
+ + BACKTRACE_STACK_BIAS);
+ current = BOUNDED_1 (current);
+ }
+ }
+ else
+ {
+ unwind_backtrace (backtrace_helper, &arg);
+
+ /* _Unwind_Backtrace seems to put NULL address above
+ _start. Fix it up here. */
+ if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
+ --arg.cnt;
+ count = arg.cnt != -1 ? arg.cnt : 0;
+ }
+ return count;
+}
+weak_alias (__backtrace, backtrace)
+libc_hidden_def (__backtrace)
diff --git a/sysdeps/sparc/sparc32/backtrace.h b/sysdeps/sparc/sparc32/backtrace.h
new file mode 100644
index 0000000000..089f8b4d28
--- /dev/null
+++ b/sysdeps/sparc/sparc32/backtrace.h
@@ -0,0 +1,7 @@
+/* Private macros for guiding the backtrace implementation, sparc32
+ version. */
+
+#define backtrace_flush_register_windows() \
+ asm volatile ("ta %0" : : "i" (ST_FLUSH_WINDOWS))
+
+#define BACKTRACE_STACK_BIAS 0
diff --git a/sysdeps/sparc/sparc32/sparcv9/backtrace.h b/sysdeps/sparc/sparc32/sparcv9/backtrace.h
new file mode 100644
index 0000000000..8d6c756717
--- /dev/null
+++ b/sysdeps/sparc/sparc32/sparcv9/backtrace.h
@@ -0,0 +1,7 @@
+/* Private macros for guiding the backtrace implementation, sparc32 v9
+ version. */
+
+#define backtrace_flush_register_windows() \
+ asm volatile ("flushw")
+
+#define BACKTRACE_STACK_BIAS 0
diff --git a/sysdeps/sparc/sparc64/backtrace.c b/sysdeps/sparc/sparc64/backtrace.c
deleted file mode 100644
index 230ca1fa26..0000000000
--- a/sysdeps/sparc/sparc64/backtrace.c
+++ /dev/null
@@ -1,57 +0,0 @@
-/* Return backtrace of current program state.
- Copyright (C) 2008-2013 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by David S. Miller <davem@davemloft.net>
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, see <http://www.gnu.org/licenses/>. */
-
-#include <execinfo.h>
-#include <stddef.h>
-#include <bp-checks.h>
-#include <sysdep.h>
-
-struct layout
-{
- unsigned long locals[8];
- unsigned long ins[6];
- unsigned long next;
- void *__unbounded return_address;
-};
-
-int
-__backtrace (void **array, int size)
-{
- struct layout *current;
- unsigned long fp;
- int count;
-
- asm volatile ("flushw");
- asm volatile ("mov %%fp, %0" : "=r"(fp));
- current = (struct layout *__unbounded) (fp + STACK_BIAS);
- current = BOUNDED_1 (current);
-
- for (count = 0; count < size; count++)
- {
- array[count] = current->return_address;
- if (!current->next)
- break;
- current = (struct layout *__unbounded) (current->next + STACK_BIAS);
- current = BOUNDED_1 (current);
- }
-
- return count;
-}
-weak_alias (__backtrace, backtrace)
-libc_hidden_def (__backtrace)
diff --git a/sysdeps/sparc/sparc64/backtrace.h b/sysdeps/sparc/sparc64/backtrace.h
new file mode 100644
index 0000000000..b9c95c51cf
--- /dev/null
+++ b/sysdeps/sparc/sparc64/backtrace.h
@@ -0,0 +1,7 @@
+/* Private macros for guiding the backtrace implementation, sparc64
+ version. */
+
+#define backtrace_flush_register_windows() \
+ asm volatile ("flushw")
+
+#define BACKTRACE_STACK_BIAS STACK_BIAS